Pre-print, Working paper: First, here is a large diversity concerning the definitions and conceptions of economic laws. Second, the very progress of modern economic research has challenged the relevance and existence of such economic laws: it has turned impossible to generalize General Equilibrium Theory and the sophistication of econometric techniques and the multiplicity of data banks has not exhibited any empirical regularity across national economies and historical periods. Third, this is precisely one of the major results derived from Régulation approaches of growth regime. On one side, one observes a significant diversity of institutional configurations, on the other side, the very success of a growth regime triggers its destabilization, therefore the erosion of previous regularities. Thus, the variety of social ties and the specificity of historical time do challenge the very concept of law in economics.